Trumpet accessories primarily include mouthpieces and mutes. Mouthpieces, made from materials like brass, nickel silver, and plastic, come in various shapes, including round and oval, with important measurements such as cup diameter (10-14mm) and depth (10-18mm). Different materials and shapes affect the trumpet's timbre. Mutes, crafted from metal, plastic, or wood, also vary in shape and have key features like inner diameter (generally 11-13mm) and material thickness, which influence timbre and volume. Performers choose accessories based on lip condition, breath control, and playing style.